A carefully conducted repository fits well into the whole repository system, which includes institutional and discipline repositories, as well as data repositories. It is possible to develop metadata aggregators owing to metadata exchange. Visibility is no less important than access to the materials on the Internet. Repositories can improve visibility of the deposited materials by taking into account the requirements of search engines, which are the basic means of obtaining scientific information for many users. The article presents general rules of improving online visibility and a few specific pieces of advice.